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<head><meta charset="utf-8"><title>weekly meeting 2019-09-05 #54818 · t-compiler · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/index.html">t-compiler</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html">weekly meeting 2019-09-05 #54818</a></h3>

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<a name="174973755"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174973755" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174973755">(Sep 05 2019 at 13:34)</a>:</h4>
<p>Hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span> ; the triage meeting will be starting in approx 30 minutes</p>



<a name="174973829"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174973829" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174973829">(Sep 05 2019 at 13:35)</a>:</h4>
<p>I will be doing <a href="#narrow/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-09-05.20.2354818" title="#narrow/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-09-05.20.2354818">pre-triage in a parallel topic</a></p>



<a name="174973985"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174973985" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174973985">(Sep 05 2019 at 13:36)</a>:</h4>
<p>The <a href="https://rust-lang.github.io/compiler-team/about/triage-meeting/" target="_blank" title="https://rust-lang.github.io/compiler-team/about/triage-meeting/">check-in calendar</a> has the PGO and pipelining groups up for check-in -- I think that <span class="user-mention" data-user-id="124287">@mw</span> is not here this week, and PGO is mostly him. Similarly, I think that the pipelining effort is largely "done", at least for its initial goals, though I see that <span class="user-mention" data-user-id="120989">@nnethercote</span> was doing some more experiments recently. So maybe we'll skip WG check-in this week.</p>



<a name="174974016"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174974016" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174974016">(Sep 05 2019 at 13:37)</a>:</h4>
<p>Next week we have polonius + rfc 2229</p>



<a name="174976208"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976208" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976208">(Sep 05 2019 at 14:01)</a>:</h4>
<p>Hello <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span>! The weekly meeting will be started now.</p>



<a name="174976269"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976269" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976269">(Sep 05 2019 at 14:02)</a>:</h4>
<p>While people filter in, let's have any...</p>
<h1>Announcements</h1>



<a name="174976311"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976311" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976311">(Sep 05 2019 at 14:02)</a>:</h4>
<p>On the pre-triage side, I only made it through the nominated issues. Mostly uneventful. One new p-high, though I'm not sure if it should be: </p>
<blockquote>
<p>Rustc does display a correct error message on type missmatch but does not show line numbers <a href="https://github.com/rust-lang/rust/issues/51635" target="_blank" title="https://github.com/rust-lang/rust/issues/51635">#51635</a></p>
</blockquote>



<a name="174976450"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976450" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976450">(Sep 05 2019 at 14:04)</a>:</h4>
<p>One announcement is that we scheduled some design meetings. You'll find them on the compiler calendar.</p>



<a name="174976462"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976462" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976462">(Sep 05 2019 at 14:04)</a>:</h4>
<p>Oh, I should update the README.md in compiler-team repo</p>



<a name="174976522"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976522" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976522">(Sep 05 2019 at 14:05)</a>:</h4>
<p>Next Friday, Sep 13: [design meeting] rust-analyzer/libraryification (<a href="https://calendar.google.com/event?action=TEMPLATE&amp;tmeid=MW00dnFnNzBycG9qbTNzYnNqYTZtZnRpaGogNnU1cnJ0Y2U2bHJ0djA3cGZpM2RhbWdqdXNAZw&amp;tmsrc=6u5rrtce6lrtv07pfi3damgjus%40group.calendar.google.com" target="_blank" title="https://calendar.google.com/event?action=TEMPLATE&amp;tmeid=MW00dnFnNzBycG9qbTNzYnNqYTZtZnRpaGogNnU1cnJ0Y2U2bHJ0djA3cGZpM2RhbWdqdXNAZw&amp;tmsrc=6u5rrtce6lrtv07pfi3damgjus%40group.calendar.google.com">calendar event</a>)</p>



<a name="174976556"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976556" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976556">(Sep 05 2019 at 14:05)</a>:</h4>
<p>After that, Friday Sep 20: [design meeting] ICE-breaker groups (<a href="https://calendar.google.com/event?action=TEMPLATE&amp;tmeid=N24yaTd0aW5hamVkYmpvOWpqdGdqZ21sMW0gNnU1cnJ0Y2U2bHJ0djA3cGZpM2RhbWdqdXNAZw&amp;tmsrc=6u5rrtce6lrtv07pfi3damgjus%40group.calendar.google.com" target="_blank" title="https://calendar.google.com/event?action=TEMPLATE&amp;tmeid=N24yaTd0aW5hamVkYmpvOWpqdGdqZ21sMW0gNnU1cnJ0Y2U2bHJ0djA3cGZpM2RhbWdqdXNAZw&amp;tmsrc=6u5rrtce6lrtv07pfi3damgjus%40group.calendar.google.com">calendar event</a>)</p>



<a name="174976606"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976606" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976606">(Sep 05 2019 at 14:06)</a>:</h4>
<p>OK, let's get started.</p>



<a name="174976632"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976632" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976632">(Sep 05 2019 at 14:06)</a>:</h4>
<p>As I noted above, we'll skip wg check-in this week, maybe the meeting will be a bit shorter</p>



<a name="174976687"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976687" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976687">(Sep 05 2019 at 14:07)</a>:</h4>
<h1><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+label%3Aregression-from-stable-to-beta++-label%3AP-high++-label%3AP-medium+-label%3AP-low+-label%3AT-libs+-label%3AT-infra+-label%3AT-rustdoc" target="_blank" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+label%3Aregression-from-stable-to-beta++-label%3AP-high++-label%3AP-medium+-label%3AP-low+-label%3AT-libs+-label%3AT-infra+-label%3AT-rustdoc">Beta regressions</a></h1>



<a name="174976708"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976708" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976708">(Sep 05 2019 at 14:07)</a>:</h4>
<p>I think I had hoped to visit some of these after meeting last time, not sure how far I got, there's kind of a lot, but I think many are expected</p>



<a name="174976738"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976738" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976738">(Sep 05 2019 at 14:07)</a>:</h4>
<p><span class="user-mention" data-user-id="123856">@Vadim Petrochenkov</span> you filed a lot of these bugs, any you wish to call attention to?</p>



<a name="174976832"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976832" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976832">(Sep 05 2019 at 14:08)</a>:</h4>
<p>I think there was general consensus that we should close " [1.38] Regression: custom attribute panicked <a href="https://github.com/rust-lang/rust/issues/63895" target="_blank" title="https://github.com/rust-lang/rust/issues/63895">#63895</a> " -- the tl;dr was that the proc macro is checking something based on the string output and that this changes</p>



<a name="174976840"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976840" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976840">(Sep 05 2019 at 14:08)</a>:</h4>
<p>in this case, <code>{  }</code> changed to <code>{}</code> or something</p>



<a name="174976893"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976893" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976893">(Sep 05 2019 at 14:09)</a>:</h4>
<p>" [1.38] Regression: proc macro panicked <a href="https://github.com/rust-lang/rust/issues/63894" target="_blank" title="https://github.com/rust-lang/rust/issues/63894">#63894</a> " looks very similar</p>



<a name="174976983"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174976983" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Vadim Petrochenkov <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174976983">(Sep 05 2019 at 14:10)</a>:</h4>
<p>From the opened issues some have some have fixes pending or merged, others are mostly wontfix.</p>



<a name="174977051"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977051" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977051">(Sep 05 2019 at 14:11)</a>:</h4>
<p>the next two ( [1.38] Regression: cannot determine resolution for the derive macro <code>Debug</code> <a href="https://github.com/rust-lang/rust/issues/63893" target="_blank" title="https://github.com/rust-lang/rust/issues/63893">#63893</a> ) and ( [1.38] Regression: expected module, found unresolved item <code>crate::mod</code> <a href="https://github.com/rust-lang/rust/issues/63891" target="_blank" title="https://github.com/rust-lang/rust/issues/63891">#63891</a> ) seem like "wontfix" but probably good to cc lang? basically subtle aspects of name resolution algorithm?</p>



<a name="174977070"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977070" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977070">(Sep 05 2019 at 14:11)</a>:</h4>
<p>maybe  [1.38] Regression: failed to resolve: could not find <code>rustc_serialize</code> in <code>{{root}}</code> <a href="https://github.com/rust-lang/rust/issues/63885" target="_blank" title="https://github.com/rust-lang/rust/issues/63885">#63885</a>  is the same?</p>



<a name="174977082"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977082" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Vadim Petrochenkov <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977082">(Sep 05 2019 at 14:11)</a>:</h4>
<p>(The issues were opened for all regressions, just to "register" them in some way, regardless of likely wontfix status.)</p>



<a name="174977101"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977101" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Vadim Petrochenkov <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977101">(Sep 05 2019 at 14:11)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/63893" target="_blank" title="https://github.com/rust-lang/rust/issues/63893">https://github.com/rust-lang/rust/issues/63893</a> is lang.</p>



<a name="174977173"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977173" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Vadim Petrochenkov <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977173">(Sep 05 2019 at 14:12)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/63891" target="_blank" title="https://github.com/rust-lang/rust/issues/63891">https://github.com/rust-lang/rust/issues/63891</a> is an outright bug (<code>Def::Err</code> created without reporting an error).</p>



<a name="174977265"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977265" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977265">(Sep 05 2019 at 14:13)</a>:</h4>
<p>ok</p>



<a name="174977279"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977279" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977279">(Sep 05 2019 at 14:13)</a>:</h4>
<p>what about  [1.38] Regression: failed to resolve: could not find <code>rustc_serialize</code> in <code>{{root}}</code> <a href="https://github.com/rust-lang/rust/issues/63885" target="_blank" title="https://github.com/rust-lang/rust/issues/63885">#63885</a>  ?</p>



<a name="174977378"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977378" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977378">(Sep 05 2019 at 14:14)</a>:</h4>
<blockquote>
<p>Probably no action required.</p>
</blockquote>



<a name="174977419"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977419" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977419">(Sep 05 2019 at 14:14)</a>:</h4>
<p>Seems to just affect tests</p>



<a name="174977427"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977427" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Vadim Petrochenkov <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977427">(Sep 05 2019 at 14:14)</a>:</h4>
<p>This is a consequense of <code>derive(RustcEncodable, RustcDecodable)</code> being implemented both in the compiler and in a third party crate.</p>



<a name="174977462"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977462" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977462">(Sep 05 2019 at 14:15)</a>:</h4>
<p><span class="user-mention" data-user-id="123856">@Vadim Petrochenkov</span> <a href="https://github.com/rust-lang/rust/issues/63886#issuecomment-528384663" target="_blank" title="https://github.com/rust-lang/rust/issues/63886#issuecomment-528384663">does this comment sound vaguely correct</a> for <a href="https://github.com/rust-lang/rust/issues/63885" target="_blank" title="https://github.com/rust-lang/rust/issues/63885">#63885</a>?</p>



<a name="174977485"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977485" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Vadim Petrochenkov <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977485">(Sep 05 2019 at 14:15)</a>:</h4>
<p>Only tests in those third-party crate (and its fork) are affected.</p>



<a name="174977494"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977494" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977494">(Sep 05 2019 at 14:15)</a>:</h4>
<blockquote>
<p>Seems to just affect tests</p>
</blockquote>
<p>yeah I was more looking for a rough explanation of what happened</p>



<a name="174977500"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977500" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977500">(Sep 05 2019 at 14:15)</a>:</h4>
<p>i.e., is it a "bug fix" or what</p>



<a name="174977533"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977533" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977533">(Sep 05 2019 at 14:15)</a>:</h4>
<blockquote>
<p>This is a consequense of derive(RustcEncodable, RustcDecodable) being implemented both in the compiler and in a third party crate.</p>
</blockquote>
<p>That makes it sound like the opposite of a bug fix? :P</p>



<a name="174977624"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977624" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977624">(Sep 05 2019 at 14:16)</a>:</h4>
<p>We should be working towards removing those two derives from the compiler imo and moving them to proc macros for rustc internals</p>



<a name="174977664"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977664" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Vadim Petrochenkov <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977664">(Sep 05 2019 at 14:17)</a>:</h4>
<p>This is not a bug-fix, but rather migration of <code>derive(RustcEncodable, RustcDecodable)</code> to 2018 edition.</p>



<a name="174977772"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977772" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977772">(Sep 05 2019 at 14:18)</a>:</h4>
<p>ok, but it's kind of specific to the rustc-serialize crate itself I guess somehow?</p>



<a name="174977811"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977811" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977811">(Sep 05 2019 at 14:18)</a>:</h4>
<p>If you are able to do a short write-up of the interaction, that'd be awesome. I can imagine though that this crate is in a rather...unique position.</p>



<a name="174977840"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977840" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977840">(Sep 05 2019 at 14:18)</a>:</h4>
<p>I'd like to move on through our triage though</p>



<a name="174977861"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977861" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977861">(Sep 05 2019 at 14:19)</a>:</h4>
<h1><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+label%3Aregression-from-stable-to-nightly++-label%3AP-high++-label%3AP-medium+-label%3AP-low+-label%3AT-infra+-label%3AT-rustdoc" target="_blank" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+label%3Aregression-from-stable-to-nightly++-label%3AP-high++-label%3AP-medium+-label%3AP-low+-label%3AT-infra+-label%3AT-rustdoc">stable to nightly regressions</a></h1>



<a name="174977893"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977893" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977893">(Sep 05 2019 at 14:19)</a>:</h4>
<blockquote>
<p>In this TiKV PR we upgraded the compiler. Our tidb_query component tripped the redundant_semicolon lint (and seemingly in turn clippy::no_effect) but rustc/clippy did not tell us the line number.</p>
</blockquote>



<a name="174977899"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977899" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Vadim Petrochenkov <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977899">(Sep 05 2019 at 14:19)</a>:</h4>
<blockquote>
<p>ok, but it's kind of specific to the rustc-serialize crate itself I guess somehow?</p>
</blockquote>
<p>Yes, that's an issue specific to rustc-serialize itself.</p>



<a name="174977908"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977908" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977908">(Sep 05 2019 at 14:19)</a>:</h4>
<p><span class="user-mention" data-user-id="119031">@Esteban Küber</span> writes:</p>
<blockquote>
<p>Introduced in <a href="https://github.com/rust-lang/rust/issues/62984" target="_blank" title="https://github.com/rust-lang/rust/issues/62984">#62984</a>. It has caused similar effects in other cases like <a href="https://github.com/rust-lang/rust/issues/63947" target="_blank" title="https://github.com/rust-lang/rust/issues/63947">#63947</a>. CC <a href="https://github.com/rust-lang/rust/issues/63679" target="_blank" title="https://github.com/rust-lang/rust/issues/63679">#63679</a>.</p>
</blockquote>



<a name="174977936"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174977936" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174977936">(Sep 05 2019 at 14:20)</a>:</h4>
<p>Seems like a good issue to write some mentoring instructions for</p>



<a name="174978024"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978024" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978024">(Sep 05 2019 at 14:20)</a>:</h4>
<p>I'll cc  nathanwhit and varkor -- done</p>



<a name="174978099"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978099" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978099">(Sep 05 2019 at 14:21)</a>:</h4>
<p>yeah; I guess we could just make the lint allow-by-default in the limit</p>



<a name="174978107"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978107" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978107">(Sep 05 2019 at 14:21)</a>:</h4>
<p>I don't really know what the problem is</p>



<a name="174978121"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978121" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978121">(Sep 05 2019 at 14:21)</a>:</h4>
<p>otoh I guess there's an easy enough workaround</p>



<a name="174978139"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978139" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978139">(Sep 05 2019 at 14:21)</a>:</h4>
<p>maybe forgot some span somewhere...?</p>



<a name="174978143"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978143" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978143">(Sep 05 2019 at 14:21)</a>:</h4>
<p>presumably</p>



<a name="174978167"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978167" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978167">(Sep 05 2019 at 14:22)</a>:</h4>
<p>I'm going to mark it as P-high I guess</p>



<a name="174978190"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978190" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978190">(Sep 05 2019 at 14:22)</a>:</h4>
<p>it's a regression</p>



<a name="174978200"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978200" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978200">(Sep 05 2019 at 14:22)</a>:</h4>
<p>and seems like it could be a fairly annoying one, if not overly serious</p>



<a name="174978214"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978214" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978214">(Sep 05 2019 at 14:22)</a>:</h4>
<p>sgtm</p>



<a name="174978287"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978287" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978287">(Sep 05 2019 at 14:23)</a>:</h4>
<p>why did you cc <span class="user-mention" data-user-id="121053">@varkor</span> ? were they mentoring or involved with the original PR?</p>



<a name="174978292"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978292" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978292">(Sep 05 2019 at 14:23)</a>:</h4>
<p>I'd love to assign to someone :)</p>



<a name="174978309"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978309" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978309">(Sep 05 2019 at 14:23)</a>:</h4>
<blockquote>
<p>were they mentoring or involved with the original PR?</p>
</blockquote>
<p>indeed; they reviewed the PR</p>



<a name="174978320"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978320" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978320">(Sep 05 2019 at 14:23)</a>:</h4>
<p>and I cced the PR author</p>



<a name="174978456"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978456" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978456">(Sep 05 2019 at 14:24)</a>:</h4>
<p>okey dokey</p>



<a name="174978467"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978467" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978467">(Sep 05 2019 at 14:24)</a>:</h4>
<p>I wrote a comment</p>



<a name="174978478"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978478" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978478">(Sep 05 2019 at 14:24)</a>:</h4>
<p>moving on</p>



<a name="174978490"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978490" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978490">(Sep 05 2019 at 14:24)</a>:</h4>
<h1><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=label%3Abeta-nominated+label%3AT-compiler" target="_blank" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=label%3Abeta-nominated+label%3AT-compiler">beta nominated PRs</a></h1>



<a name="174978538"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978538" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978538">(Sep 05 2019 at 14:25)</a>:</h4>
<p>we've got 4</p>



<a name="174978554"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978554" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978554">(Sep 05 2019 at 14:25)</a>:</h4>
<blockquote>
<p>Update xLTO compatibility table in rustc book. <a href="https://github.com/rust-lang/rust/issues/64092" target="_blank" title="https://github.com/rust-lang/rust/issues/64092">#64092</a></p>
</blockquote>



<a name="174978562"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978562" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978562">(Sep 05 2019 at 14:25)</a>:</h4>
<blockquote>
<p>Support "soft" feature-gating using a lint <a href="https://github.com/rust-lang/rust/issues/64066" target="_blank" title="https://github.com/rust-lang/rust/issues/64066">#64066</a></p>
</blockquote>



<a name="174978571"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978571" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978571">(Sep 05 2019 at 14:25)</a>:</h4>
<blockquote>
<p><del> fix nounwind attribute logic <a href="https://github.com/rust-lang/rust/issues/63909" target="_blank" title="https://github.com/rust-lang/rust/issues/63909"><a href="https://github.com/rust-lang/rust/issues/63909" target="_blank" title="https://github.com/rust-lang/rust/issues/63909">#63909</a></a></del></p>
</blockquote>



<a name="174978579"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978579" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978579">(Sep 05 2019 at 14:25)</a>:</h4>
<blockquote>
<p>pprust: Do not print spaces before some tokens <a href="https://github.com/rust-lang/rust/issues/63897" target="_blank" title="https://github.com/rust-lang/rust/issues/63897">#63897</a></p>
</blockquote>



<a name="174978670"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978670" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978670">(Sep 05 2019 at 14:26)</a>:</h4>
<p>I think that <a href="https://github.com/rust-lang/rust/issues/63909" target="_blank" title="https://github.com/rust-lang/rust/issues/63909">#63909</a> we kind of decided not to do in lang team meeting? presuming we make progress on that RFC? (cc <span class="user-mention" data-user-id="127859">@Taylor Cramer</span>, <span class="user-mention" data-user-id="120076">@Kyle Strand</span> =))</p>



<a name="174978731"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978731" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978731">(Sep 05 2019 at 14:27)</a>:</h4>
<p>I am very confused as to what we decided on the nounwind thing</p>



<a name="174978745"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978745" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978745">(Sep 05 2019 at 14:27)</a>:</h4>
<p>I feel as tho we didn't reach a firm conclusion</p>



<a name="174978780"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978780" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978780">(Sep 05 2019 at 14:27)</a>:</h4>
<p>and there seems to be some back &amp; forth on the <code>#[unwind(...)]</code> stuff after as well</p>



<a name="174978899"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978899" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978899">(Sep 05 2019 at 14:28)</a>:</h4>
<blockquote>
<p>pprust: Do not print spaces before some tokens <a href="https://github.com/rust-lang/rust/issues/63897" target="_blank" title="https://github.com/rust-lang/rust/issues/63897">#63897</a></p>
</blockquote>
<p><span class="user-mention" data-user-id="116009">@nikomatsakis</span> should the language team discuss this?</p>



<a name="174978904"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978904" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978904">(Sep 05 2019 at 14:28)</a>:</h4>
<p>OK, those all seem like "no brainers" for the most part, so I'm marking them all as beta-accepted</p>



<a name="174978913"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978913" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978913">(Sep 05 2019 at 14:28)</a>:</h4>
<p>there seems to be a larger question of pretty printing policy here</p>



<a name="174978928"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978928" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978928">(Sep 05 2019 at 14:29)</a>:</h4>
<p>aside from this particular instance</p>



<a name="174978933"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978933" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978933">(Sep 05 2019 at 14:29)</a>:</h4>
<p>I think we should both accept the PR and we can discuss the general issue</p>



<a name="174978945"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978945" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978945">(Sep 05 2019 at 14:29)</a>:</h4>
<p>that is, I don't think we need to block the PR</p>



<a name="174978956"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978956" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978956">(Sep 05 2019 at 14:29)</a>:</h4>
<p>but it's a good topic to bring up anyway and make people aware of</p>



<a name="174978991"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174978991" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174978991">(Sep 05 2019 at 14:29)</a>:</h4>
<p>I think I actually created a doc for this week but faile toa dd it to the page, we can add it to the agenda...</p>



<a name="174979000"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174979000" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174979000">(Sep 05 2019 at 14:29)</a>:</h4>
<p>agreed; let's nominate this specific PR as a proxy for the general issue?</p>



<a name="174979024"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174979024" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174979024">(Sep 05 2019 at 14:30)</a>:</h4>
<p>sure.</p>



<a name="174979126"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174979126" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174979126">(Sep 05 2019 at 14:30)</a>:</h4>
<p>(also, I agree with you that we should revisit the unwind thing)</p>



<a name="174979130"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174979130" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174979130">(Sep 05 2019 at 14:30)</a>:</h4>
<p>ok, that's the betas</p>



<a name="174979213"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174979213" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174979213">(Sep 05 2019 at 14:32)</a>:</h4>
<p>since we don't have working group check-ins, the only thing left would be to review P-high bugs, but I'm not inclined to do that -- I'd like to maybe schedule a more dedicated time to review that, but next week, once <span class="user-mention" data-user-id="116083">@pnkfelix</span> is back (and <span class="user-mention" data-user-id="124287">@mw</span> is around)</p>



<a name="174979257"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174979257" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174979257">(Sep 05 2019 at 14:32)</a>:</h4>
<p>make sense?</p>



<a name="174979268"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174979268" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174979268">(Sep 05 2019 at 14:32)</a>:</h4>
<p>if so, any final topics to discuss? or shall we end meeting early?</p>



<a name="174979279"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174979279" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174979279">(Sep 05 2019 at 14:32)</a>:</h4>
<p>(also, did I overlook something...)</p>



<a name="174979464"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-09-05%20%2354818/near/174979464" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-09-05.20.2354818.html#174979464">(Sep 05 2019 at 14:34)</a>:</h4>
<p>OK <span aria-label="wave" class="emoji emoji-1f44b" role="img" title="wave">:wave:</span> thanks all for attending! <span aria-label="heart eyes" class="emoji emoji-1f60d" role="img" title="heart eyes">:heart_eyes:</span></p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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